Premium
Interwoven NiCo 2 O 4 Nanosheet/Carbon Nanotube Composites as Highly Efficient Lithium−Sulfur Cathode Hosts
Author(s) -
Xiao Dengji,
Zhang Huifang,
Chen Chenmeng,
Liu Yaodong,
Yuan Shuxia,
Lu Chunxiang
Publication year - 2017
Publication title -
chemelectrochem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.182
H-Index - 59
ISSN - 2196-0216
DOI - 10.1002/celc.201700643
Subject(s) - nanosheet , materials science , sulfur , electrolyte , carbon nanotube , cathode , chemical engineering , annealing (glass) , nanotube , polysulfide , carbon fibers , nanotechnology , composite material , electrode , chemistry , composite number , engineering , metallurgy
Lithium−sulfur (Li−S) batteries are one of the most promising candidates for the next generation of rechargeable battery systems, because of their high energy density and cost effectiveness. But, their commercialized applications are hindered by fast capacity fading and poor cycling stability. In this work, sulfur hosts based on interwoven NiCo 2 O 4 nanosheet/carbon nanotube composites are designed and synthesized by using a solvothermal reaction and subsequent annealing. In this unique material architecture, the carbon nanotubes construct a porous conductive network across the NiCo 2 O 4 nanosheets to provide fast electron paths. In addition, the NiCo 2 O 4 nanosheets can chemically bind polysulfides to restrain their diffusion into electrolyte. As a result, the Li−S batteries based on this sulfur host exhibit high specific capacity, excellent cycling stability, and good rate capability. Reversible specific capacities of 1311 and 575 mA h g −1 are achieved at rates of 0.1 and 2 C, respectively, together with an excellent cycling stability of 0.038 % capacity decay per cycle over 1200 cycles at 0.5 C.